/*
    * ImageInfo.java Version 1.7 A Java class to determine image width, height and
    * color depth for a number of image file formats. Written by Marco Schmidt
    * Contributed to the Public Domain.
    */
   
   package ecar.pojo;
   
   import java.io.DataInput;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.math.BigDecimal;
  import java.net.URL;
  import java.util.Vector;
  
  /**
   * Get file format, image resolution, number of bits per pixel and optionally
   * number of images, comments and physical resolution from JPEG, GIF, BMP, PCX,
   * PNG, IFF, RAS, PBM, PGM, PPM and PSD files (or input streams).
   * <p>
   * Use the class like this:
   * 
   * <pre>
   * ImageInfo ii = new ImageInfo();
   * ii.setInput(in); // in can be InputStream or RandomAccessFile
   * ii.setDetermineImageNumber(true); // default is false
   * ii.setCollectComments(true); // default is false
   * if (!ii.check()) {
   *   System.err.println(&quot;Not a supported image file format.&quot;);
   *   return;
   * }
   * System.out.println(ii.getFormatName() + &quot;, &quot; + ii.getMimeType() + &quot;, &quot; + ii.getWidth() + &quot; x &quot; + ii.getHeight() + &quot; pixels, &quot; + ii.getBitsPerPixel() + &quot; bits per pixel, &quot; + ii.getNumberOfImages() + &quot; image(s), &quot; + ii.getNumberOfComments() + &quot; comment(s).&quot;);
   * // there are other properties, check out the API documentation
   * </pre>
   * 
   * You can also use this class as a command line program. Call it with a number
   * of image file names and URLs as parameters:
   * 
   * <pre>
   *   java ImageInfo *.jpg *.png *.gif http://somesite.tld/image.jpg
   * </pre>
   * 
   * or call it without parameters and pipe data to it:
   * 
   * <pre>
   *   java ImageInfo &lt; image.jpg
   * </pre>
   * <p>
   * Known limitations:
   * <ul>
   * <li>When the determination of the number of images is turned off, GIF bits
   * per pixel are only read from the global header. For some GIFs, local palettes
   * change this to a typically larger value. To be certain to get the correct
   * color depth, call setDetermineImageNumber(true) before calling check(). The
   * complete scan over the GIF file will take additional time.</li>
   * <li>Transparency information is not included in the bits per pixel count.
   * Actually, it was my decision not to include those bits, so it's a feature!
   * ;-)</li>
   * </ul>
   * <p>
   * Requirements:
   * <ul>
   * <li>Java 1.1 or higher</li>
   * </ul>
   * <p>
   * The latest version can be found at <a
   * href="http://schmidt.devlib.org/image-info/"
   * >http://schmidt.devlib.org/image-info/</a>.
   * <p>
   * Written by Marco Schmidt.
   * <p>
   * This class is contributed to the Public Domain. Use it at your own risk.
   * <p>
   * Last modification 2005-07-26.
   * <p>
   * <a name="history">History</a>:
   * <ul>
   * <li><strong>2001-08-24</strong> Initial version.</li>
   * <li><strong>2001-10-13</strong> Added support for the file formats BMP and
   * PCX.</li>
   * <li><strong>2001-10-16</strong> Fixed bug in read(int[], int, int) that
   * returned
   * <li><strong>2002-01-22</strong> Added support for file formats Amiga IFF and
   * Sun Raster (RAS).</li>
   * <li><strong>2002-01-24</strong> Added support for file formats Portable
   * Bitmap / Graymap / Pixmap (PBM, PGM, PPM) and Adobe Photoshop (PSD). Added
   * new method getMimeType() to return the MIME type associated with a particular
   * file format.</li>
   * <li><strong>2002-03-15</strong> Added support to recognize number of images
   * in file. Only works with GIF. Use {@link #setDetermineImageNumber} with
   * <code>true</code> as argument to identify animated GIFs (
   * {@link #getNumberOfImages()} will return a value larger than <code>1</code>).
   * </li>
   * <li><strong>2002-04-10</strong> Fixed a bug in the feature 'determine number
   * of images in animated GIF' introduced with version 1.1. Thanks to Marcelo P.
   * Lima for sending in the bug report. Released as 1.1.1.</li>
   * <li><strong>2002-04-18</strong> Added {@link #setCollectComments(boolean)}.
   * That new method lets the user specify whether textual comments are to be
  * stored in an internal list when encountered in an input image file / stream.
  * Added two methods to return the physical width and height of the image in
  * dpi: {@link #getPhysicalWidthDpi()} and {@link #getPhysicalHeightDpi()}. If
  * the physical resolution could not be retrieved, these methods return
  * <code>-1</code>.</li>
  * <li><strong>2002-04-23</strong> Added support for the new properties physical
  * resolution and comments for some formats. Released as 1.2.</li>
  * <li><strong>2002-06-17</strong> Added support for SWF, sent in by Michael
  * Aird. Changed checkJpeg() so that other APP markers than APP0 will not lead
  * to a failure anymore. Released as 1.3.</li>
  * <li><strong>2003-07-28</strong> Bug fix - skip method now takes return values
  * into consideration. Less bytes than necessary may have been skipped, leading
  * to flaws in the retrieved information in some cases. Thanks to Bernard
  * Bernstein for pointing that out. Released as 1.4.</li>
  * <li><strong>2004-02-29</strong> Added support for recognizing progressive
  * JPEG and interlaced PNG and GIF. A new method {@link #isProgressive()}
  * returns whether ImageInfo has found that the storage type is progressive (or
  * interlaced). Thanks to Joe Germuska for suggesting the feature. Bug fix: BMP
  * physical resolution is now correctly determined. Released as 1.5.</li>
  * <li><strong>2004-11-30</strong> Bug fix: recognizing progressive GIFs
  * (interlaced in GIF terminology) did not work (thanks to Franz Jeitler for
  * pointing this out). Now it should work, but only if the number of images is
  * determined. This is because information on interlacing is stored in a local
  * image header. In theory, different images could be stored interlaced and
  * non-interlaced in one file. However, I think that's unlikely. Right now, the
  * last image in the GIF file that is examined by ImageInfo is used for the
  * "progressive" status.</li>
  * <li><strong>2005-01-02</strong> Some code clean up (unused methods and
  * variables commented out, missing javadoc comments, etc.). Thanks to George
  * Sexton for a long list. Removed usage of Boolean.toString because it's a Java
  * 1.4+ feature (thanks to Gregor Dupont). Changed delimiter character in
  * compact output from semicolon to tabulator (for better integration with
  * cut(1) and other Unix tools). Added some points to the <a
  * href="http://schmidt.devlib.org/image-info/index.html#knownissues">'Known
  * issues' section of the website</a>. Released as 1.6.</li>
  * <li><strong>2005-07-26</strong> Removed code to identify Flash (SWF) files.
  * Has repeatedly led to problems and support requests, and I don't know the
  * format and don't have the time and interest to fix it myself. I repeatedly
  * included fixes by others which didn't work for some people. I give up on SWF.
  * Please do not contact me about it anymore. Set package of ImageInfo class to
  * org.devlib.schmidt.imageinfo (a package was repeatedly requested by some
  * users). Released as 1.7.</li>
  * </ul>
  * @author Marco Schmidt
  */
 public class ImageInfo {
   /**
    * Return value of {@link #getFormat()} for JPEG streams. ImageInfo can
    * extract physical resolution and comments from JPEGs (only from APP0
    * headers). Only one image can be stored in a file. It is determined whether
    * the JPEG stream is progressive (see {@link #isProgressive()}).
    */
   public static final int FORMAT_JPEG = 0;
 
   /**
    * Return value of {@link #getFormat()} for GIF streams. ImageInfo can extract
    * comments from GIFs and count the number of images (GIFs with more than one
    * image are animations). It is determined whether the GIF stream is
    * interlaced (see {@link #isProgressive()}).
    */
   public static final int FORMAT_GIF = 1;
 
   /**
    * Return value of {@link #getFormat()} for PNG streams. PNG only supports one
    * image per file. Both physical resolution and comments can be stored with
    * PNG, but ImageInfo is currently not able to extract those. It is determined
    * whether the PNG stream is interlaced (see {@link #isProgressive()}).
    */
   public static final int FORMAT_PNG = 2;
 
   /**
    * Return value of {@link #getFormat()} for BMP streams. BMP only supports one
    * image per file. BMP does not allow for comments. The physical resolution
    * can be stored.
    */
   public static final int FORMAT_BMP = 3;
 
   /**
    * Return value of {@link #getFormat()} for PCX streams. PCX does not allow
    * for comments or more than one image per file. However, the physical
    * resolution can be stored.
    */
   public static final int FORMAT_PCX = 4;
 
   /**
    * Return value of {@link #getFormat()} for IFF streams.
    */
   public static final int FORMAT_IFF = 5;
 
   /**
    * Return value of {@link #getFormat()} for RAS streams. Sun Raster allows for
    * one image per file only and is not able to store physical resolution or
    * comments.
    */
   public static final int FORMAT_RAS = 6;
 
   /** Return value of {@link #getFormat()} for PBM streams. */
   public static final int FORMAT_PBM = 7;
 
   /** Return value of {@link #getFormat()} for PGM streams. */
   public static final int FORMAT_PGM = 8;
 
   /** Return value of {@link #getFormat()} for PPM streams. */
   public static final int FORMAT_PPM = 9;
 
   /** Return value of {@link #getFormat()} for PSD streams. */
   public static final int FORMAT_PSD = 10;
 
   /*
    * public static final int COLOR_TYPE_UNKNOWN = -1; public static final int
    * COLOR_TYPE_TRUECOLOR_RGB = 0; public static final int COLOR_TYPE_PALETTED =
    * 1; public static final int COLOR_TYPE_GRAYSCALE= 2; public static final int
    * COLOR_TYPE_BLACK_AND_WHITE = 3;
    */
 
   /**
    * The names of all supported file formats. The FORMAT_xyz int constants can
    * be used as index values for this array.
    */
   private static final String[] FORMAT_NAMES = { "JPEG", "GIF", "PNG", "BMP", "PCX", "IFF", "RAS", "PBM", "PGM", "PPM", "PSD" };
 
   /**
    * The names of the MIME types for all supported file formats. The FORMAT_xyz
    * int constants can be used as index values for this array.
    */
   private static final String[] MIME_TYPE_STRINGS = { "image/jpeg", "image/gif", "image/png", "image/bmp", "image/pcx", "image/iff", "image/ras", "image/x-portable-bitmap", "image/x-portable-graymap", "image/x-portable-pixmap", "image/psd" };
 
   private int width;
   private int height;
   private int bitsPerPixel;
   // private int colorType = COLOR_TYPE_UNKNOWN;
   private boolean progressive;
   private int format;
   private InputStream in;
   private DataInput din;
   private boolean collectComments = true;
   private Vector comments;
   private boolean determineNumberOfImages;
   private int numberOfImages;
   private int physicalHeightDpi;
   private int physicalWidthDpi;
   private int bitBuf;
   private int bitPos;
 
   private void addComment(String s) {
     if (comments == null) {
       comments = new Vector();
     }
     comments.addElement(s);
   }
 
   /**
    * Call this method after you have provided an input stream or file using
    * {@link #setInput(InputStream)} or {@link #setInput(DataInput)}. If true is
    * returned, the file format was known and information on the file's content
    * can be retrieved using the various getXyz methods.
    * @return if information could be retrieved from input
    */
   public boolean check() {
     format = -1;
     width = -1;
     height = -1;
     bitsPerPixel = -1;
     numberOfImages = 1;
     physicalHeightDpi = -1;
     physicalWidthDpi = -1;
     comments = null;
     try {
       int b1 = read() & 0xff;
       int b2 = read() & 0xff;
       if (b1 == 0x47 && b2 == 0x49) {
         return checkGif();
       }
       else if (b1 == 0x89 && b2 == 0x50) {
         return checkPng();
       }
       else if (b1 == 0xff && b2 == 0xd8) {
         return checkJpeg();
       }
       else if (b1 == 0x42 && b2 == 0x4d) {
         return checkBmp();
       }
       else if (b1 == 0x0a && b2 < 0x06) {
         return checkPcx();
       }
       else if (b1 == 0x46 && b2 == 0x4f) {
         return checkIff();
       }
       else if (b1 == 0x59 && b2 == 0xa6) {
         return checkRas();
       }
       else if (b1 == 0x50 && b2 >= 0x31 && b2 <= 0x36) {
         return checkPnm(b2 - '0');
       }
       else if (b1 == 0x38 && b2 == 0x42) {
         return checkPsd();
       }
       else {
         return false;
       }
     } catch (IOException ioe) {
       return false;
     }
   }
 
   private boolean checkBmp() throws IOException {
     byte[] a = new byte[44];
     if (read(a) != a.length) {
       return false;
     }
     width = getIntLittleEndian(a, 16);
     height = getIntLittleEndian(a, 20);
     if (width < 1 || height < 1) {
       return false;
     }
     bitsPerPixel = getShortLittleEndian(a, 26);
     if (bitsPerPixel != 1 && bitsPerPixel != 4 && bitsPerPixel != 8 && bitsPerPixel != 16 && bitsPerPixel != 24 && bitsPerPixel != 32) {
       return false;
     }
     int x = (int) (getIntLittleEndian(a, 36) * 0.0254);
     if (x > 0) {
       setPhysicalWidthDpi(x);
     }
     int y = (int) (getIntLittleEndian(a, 40) * 0.0254);
     if (y > 0) {
       setPhysicalHeightDpi(y);
     }
     format = FORMAT_BMP;
     return true;
   }
 
   private boolean checkGif() throws IOException {
     final byte[] GIF_MAGIC_87A = { 0x46, 0x38, 0x37, 0x61 };
     final byte[] GIF_MAGIC_89A = { 0x46, 0x38, 0x39, 0x61 };
     byte[] a = new byte[11]; // 4 from the GIF signature + 7 from the global
                              // header
     if (read(a) != 11) {
       return false;
     }
     if ((!equals(a, 0, GIF_MAGIC_89A, 0, 4)) && (!equals(a, 0, GIF_MAGIC_87A, 0, 4))) {
       return false;
     }
     format = FORMAT_GIF;
     width = getShortLittleEndian(a, 4);
     height = getShortLittleEndian(a, 6);
     int flags = a[8] & 0xff;
     bitsPerPixel = ((flags >> 4) & 0x07) + 1;
     // progressive = (flags & 0x02) != 0;
     if (!determineNumberOfImages) {
       return true;
     }
     // skip global color palette
     if ((flags & 0x80) != 0) {
       int tableSize = (1 << ((flags & 7) + 1)) * 3;
       skip(tableSize);
     }
     numberOfImages = 0;
     int blockType;
     do {
       blockType = read();
       switch (blockType) {
       case (0x2c): // image separator
       {
         if (read(a, 0, 9) != 9) {
           return false;
         }
         flags = a[8] & 0xff;
         progressive = (flags & 0x40) != 0;
         /*
          * int locWidth = getShortLittleEndian(a, 4); int locHeight =
          * getShortLittleEndian(a, 6); System.out.println("LOCAL: " + locWidth +
          * " x " + locHeight);
          */
         int localBitsPerPixel = (flags & 0x07) + 1;
         if (localBitsPerPixel > bitsPerPixel) {
           bitsPerPixel = localBitsPerPixel;
         }
         if ((flags & 0x80) != 0) {
           skip((1 << localBitsPerPixel) * 3);
         }
         skip(1); // initial code length
         int n;
         do {
           n = read();
           if (n > 0) {
             skip(n);
           }
           else if (n == -1) {
             return false;
           }
         } while (n > 0);
         numberOfImages++;
         break;
       }
       case (0x21): // extension
       {
         int extensionType = read();
         if (collectComments && extensionType == 0xfe) {
           StringBuffer sb = new StringBuffer();
           int n;
           do {
             n = read();
             if (n == -1) {
               return false;
             }
             if (n > 0) {
               for (int i = 0; i < n; i++) {
                 int ch = read();
                 if (ch == -1) {
                   return false;
                 }
                 sb.append((char) ch);
               }
             }
           } while (n > 0);
         }
         else {
           int n;
           do {
             n = read();
             if (n > 0) {
               skip(n);
             }
             else if (n == -1) {
               return false;
             }
           } while (n > 0);
         }
         break;
       }
       case (0x3b): // end of file
       {
         break;
       }
       default: {
         return false;
       }
       }
     } while (blockType != 0x3b);
     return true;
   }
 
   private boolean checkIff() throws IOException {
     byte[] a = new byte[10];
     // read remaining 2 bytes of file id, 4 bytes file size
     // and 4 bytes IFF subformat
     if (read(a, 0, 10) != 10) {
       return false;
     }
     final byte[] IFF_RM = { 0x52, 0x4d };
     if (!equals(a, 0, IFF_RM, 0, 2)) {
       return false;
     }
     int type = getIntBigEndian(a, 6);
     if (type != 0x494c424d && // type must be ILBM...
     type != 0x50424d20) { // ...or PBM
       return false;
     }
     // loop chunks to find BMHD chunk
     do {
       if (read(a, 0, 8) != 8) {
         return false;
       }
       int chunkId = getIntBigEndian(a, 0);
       int size = getIntBigEndian(a, 4);
       if ((size & 1) == 1) {
         size++;
       }
       if (chunkId == 0x424d4844) { // BMHD chunk
         if (read(a, 0, 9) != 9) {
           return false;
         }
         format = FORMAT_IFF;
         width = getShortBigEndian(a, 0);
         height = getShortBigEndian(a, 2);
         bitsPerPixel = a[8] & 0xff;
         return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel < 33);
       }
       else {
         skip(size);
       }
     } while (true);
   }
 
   private boolean checkJpeg() throws IOException {
     byte[] data = new byte[12];
     while (true) {
       if (read(data, 0, 4) != 4) {
         return false;
       }
       int marker = getShortBigEndian(data, 0);
       int size = getShortBigEndian(data, 2);
       if ((marker & 0xff00) != 0xff00) {
         return false; // not a valid marker
       }
       if (marker == 0xffe0) { // APPx
         if (size < 14) {
           return false; // APPx header must be >= 14 bytes
         }
         if (read(data, 0, 12) != 12) {
           return false;
         }
         final byte[] APP0_ID = { 0x4a, 0x46, 0x49, 0x46, 0x00 };
         if (equals(APP0_ID, 0, data, 0, 5)) {
           // System.out.println("data 7=" + data[7]);
           if (data[7] == 1) {
             setPhysicalWidthDpi(getShortBigEndian(data, 8));
             setPhysicalHeightDpi(getShortBigEndian(data, 10));
           }
           else if (data[7] == 2) {
             int x = getShortBigEndian(data, 8);
             int y = getShortBigEndian(data, 10);
             setPhysicalWidthDpi((int) (x * 2.54f));
             setPhysicalHeightDpi((int) (y * 2.54f));
           }
         }
         skip(size - 14);
       }
       else if (collectComments && size > 2 && marker == 0xfffe) { // comment
         size -= 2;
         byte[] chars = new byte[size];
         if (read(chars, 0, size) != size) {
           return false;
         }
         String comment = new String(chars, "iso-8859-1");
         comment = comment.trim();
         addComment(comment);
       }
       else if (marker >= 0xffc0 && marker <= 0xffcf && marker != 0xffc4 && marker != 0xffc8) {
         if (read(data, 0, 6) != 6) {
           return false;
         }
         format = FORMAT_JPEG;
         bitsPerPixel = (data[0] & 0xff) * (data[5] & 0xff);
         progressive = marker == 0xffc2 || marker == 0xffc6 || marker == 0xffca || marker == 0xffce;
         width = getShortBigEndian(data, 3);
         height = getShortBigEndian(data, 1);
         return true;
       }
       else {
         skip(size - 2);
       }
     }
   }
 
   private boolean checkPcx() throws IOException {
     byte[] a = new byte[64];
     if (read(a) != a.length) {
       return false;
     }
     if (a[0] != 1) { // encoding, 1=RLE is only valid value
       return false;
     }
     // width / height
     int x1 = getShortLittleEndian(a, 2);
     int y1 = getShortLittleEndian(a, 4);
     int x2 = getShortLittleEndian(a, 6);
     int y2 = getShortLittleEndian(a, 8);
     if (x1 < 0 || x2 < x1 || y1 < 0 || y2 < y1) {
       return false;
     }
     width = x2 - x1 + 1;
     height = y2 - y1 + 1;
     // color depth
     int bits = a[1];
     int planes = a[63];
     if (planes == 1 && (bits == 1 || bits == 2 || bits == 4 || bits == 8)) {
       // paletted
       bitsPerPixel = bits;
     }
     else if (planes == 3 && bits == 8) {
       // RGB truecolor
       bitsPerPixel = 24;
     }
     else {
       return false;
     }
     setPhysicalWidthDpi(getShortLittleEndian(a, 10));
     setPhysicalHeightDpi(getShortLittleEndian(a, 10));
     format = FORMAT_PCX;
     return true;
   }
 
   private boolean checkPng() throws IOException {
     final byte[] PNG_MAGIC = { 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
     byte[] a = new byte[27];
     if (read(a) != 27) {
       return false;
     }
     if (!equals(a, 0, PNG_MAGIC, 0, 6)) {
       return false;
     }
     format = FORMAT_PNG;
     width = getIntBigEndian(a, 14);
     height = getIntBigEndian(a, 18);
     bitsPerPixel = a[22] & 0xff;
     int colorType = a[23] & 0xff;
     if (colorType == 2 || colorType == 6) {
       bitsPerPixel *= 3;
     }
     progressive = (a[26] & 0xff) != 0;
     return true;
   }
 
   private boolean checkPnm(int id) throws IOException {
     if (id < 1 || id > 6) {
       return false;
     }
     final int[] PNM_FORMATS = { FORMAT_PBM, FORMAT_PGM, FORMAT_PPM };
     format = PNM_FORMATS[(id - 1) % 3];
     boolean hasPixelResolution = false;
     String s;
     while (true) {
       s = readLine();
       if (s != null) {
         s = s.trim();
       }
       if (s == null || s.length() < 1) {
         continue;
       }
       if (s.charAt(0) == '#') { // comment
         if (collectComments && s.length() > 1) {
           addComment(s.substring(1));
         }
         continue;
       }
       if (!hasPixelResolution) { // split "343 966" into width=343, height=966
         int spaceIndex = s.indexOf(' ');
         if (spaceIndex == -1) {
           return false;
         }
         String widthString = s.substring(0, spaceIndex);
         spaceIndex = s.lastIndexOf(' ');
         if (spaceIndex == -1) {
           return false;
         }
         String heightString = s.substring(spaceIndex + 1);
         try {
           width = Integer.parseInt(widthString);
           height = Integer.parseInt(heightString);
         } catch (NumberFormatException nfe) {
           return false;
         }
         if (width < 1 || height < 1) {
           return false;
         }
         if (format == FORMAT_PBM) {
           bitsPerPixel = 1;
           return true;
         }
         hasPixelResolution = true;
       }
       else {
         int maxSample;
         try {
           maxSample = Integer.parseInt(s);
         } catch (NumberFormatException nfe) {
           return false;
         }
         if (maxSample < 0) {
           return false;
         }
         for (int i = 0; i < 25; i++) {
           if (maxSample < (1 << (i + 1))) {
             bitsPerPixel = i + 1;
             if (format == FORMAT_PPM) {
               bitsPerPixel *= 3;
             }
             return true;
           }
         }
         return false;
       }
     }
   }
 
   private boolean checkPsd() throws IOException {
     byte[] a = new byte[24];
     if (read(a) != a.length) {
       return false;
     }
     final byte[] PSD_MAGIC = { 0x50, 0x53 };
     if (!equals(a, 0, PSD_MAGIC, 0, 2)) {
       return false;
     }
     format = FORMAT_PSD;
     width = getIntBigEndian(a, 16);
     height = getIntBigEndian(a, 12);
     int channels = getShortBigEndian(a, 10);
     int depth = getShortBigEndian(a, 20);
     bitsPerPixel = channels * depth;
     return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel <= 64);
   }
 
   private boolean checkRas() throws IOException {
     byte[] a = new byte[14];
     if (read(a) != a.length) {
       return false;
     }
     final byte[] RAS_MAGIC = { 0x6a, (byte) 0x95 };
     if (!equals(a, 0, RAS_MAGIC, 0, 2)) {
       return false;
     }
     format = FORMAT_RAS;
     width = getIntBigEndian(a, 2);
     height = getIntBigEndian(a, 6);
     bitsPerPixel = getIntBigEndian(a, 10);
     return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel <= 24);
   }
 
   /**
    * Run over String list, return false iff at least one of the arguments equals
    * <code>-c</code>.
    * @param args string list to check
    */
   private static boolean determineVerbosity(String[] args) {
     if (args != null && args.length > 0) {
       for (int i = 0; i < args.length; i++) {
         if ("-c".equals(args[i])) {
           return false;
         }
       }
     }
     return true;
   }
 
   private static boolean equals(byte[] a1, int offs1, byte[] a2, int offs2, int num) {
     while (num-- > 0) {
       if (a1[offs1++] != a2[offs2++]) {
         return false;
       }
     }
     return true;
   }
 
   /**
    * If {@link #check()} was successful, returns the image's number of bits per
    * pixel. Does not include transparency information like the alpha channel.
    * @return number of bits per image pixel
    */
   public int getBitsPerPixel() {
     return bitsPerPixel;
   }
 
   /**
    * Returns the index'th comment retrieved from the file.
    * @param index int index of comment to return
    * @throws IllegalArgumentException if index is smaller than 0 or larger than
    *           or equal to the number of comments retrieved
    * @see #getNumberOfComments
    */
   public String getComment(int index) {
     if (comments == null || index < 0 || index >= comments.size()) {
       throw new IllegalArgumentException("Not a valid comment index: " + index);
     }
     return (String) comments.elementAt(index);
   }
 
   /**
    * If {@link #check()} was successful, returns the image format as one of the
    * FORMAT_xyz constants from this class. Use {@link #getFormatName()} to get a
    * textual description of the file format.
    * @return file format as a FORMAT_xyz constant
    */
   public int getFormat() {
     return format;
   }
 
   /**
    * If {@link #check()} was successful, returns the image format's name. Use
    * {@link #getFormat()} to get a unique number.
    * @return file format name
    */
   public String getFormatName() {
     if (format >= 0 && format < FORMAT_NAMES.length) {
       return FORMAT_NAMES[format];
     }
     else {
       return "?";
     }
   }
 
   /**
    * If {@link #check()} was successful, returns one the image's vertical
    * resolution in pixels.
    * @return image height in pixels
    */
   public int getHeight() {
     return height;
   }
 
   private static int getIntBigEndian(byte[] a, int offs) {
     return (a[offs] & 0xff) << 24 | (a[offs + 1] & 0xff) << 16 | (a[offs + 2] & 0xff) << 8 | a[offs + 3] & 0xff;
   }
 
   private static int getIntLittleEndian(byte[] a, int offs) {
     return (a[offs + 3] & 0xff) << 24 | (a[offs + 2] & 0xff) << 16 | (a[offs + 1] & 0xff) << 8 | a[offs] & 0xff;
   }
 
   /**
    * If {@link #check()} was successful, returns a String with the MIME type of
    * the format.
    * @return MIME type, e.g. <code>image/jpeg</code>
    */
   public String getMimeType() {
     if (format >= 0 && format < MIME_TYPE_STRINGS.length) {
       if (format == FORMAT_JPEG && progressive) {
         return "image/pjpeg";
       }
       return MIME_TYPE_STRINGS[format];
     }
     else {
       return null;
     }
   }
 
   /**
    * If {@link #check()} was successful and {@link #setCollectComments(boolean)}
    * was called with <code>true</code> as argument, returns the number of
    * comments retrieved from the input image stream / file. Any number &gt;= 0
    * and smaller than this number of comments is then a valid argument for the
    * {@link #getComment(int)} method.
    * @return number of comments retrieved from input image
    */
   public int getNumberOfComments() {
     if (comments == null) {
       return 0;
     }
     else {
       return comments.size();
     }
   }
 
   /**
    * Returns the number of images in the examined file. Assumes that
    * <code>setDetermineImageNumber(true);</code> was called before a successful
    * call to {@link #check()}. This value can currently be only different from
    * <code>1</code> for GIF images.
    * @return number of images in file
    */
   public int getNumberOfImages() {
     return numberOfImages;
   }
 
   /**
    * Returns the physical height of this image in dots per inch (dpi). Assumes
    * that {@link #check()} was successful. Returns <code>-1</code> on failure.
    * @return physical height (in dpi)
    * @see #getPhysicalWidthDpi()
    * @see #getPhysicalHeightInch()
    */
   public int getPhysicalHeightDpi() {
     return physicalHeightDpi;
   }
 
   /**
    * If {@link #check()} was successful, returns the physical width of this
    * image in dpi (dots per inch) or -1 if no value could be found.
    * @return physical height (in dpi)
    * @see #getPhysicalHeightDpi()
    * @see #getPhysicalWidthDpi()
    * @see #getPhysicalWidthInch()
    */
   public float getPhysicalHeightInch() {
     int h = getHeight();
     int ph = getPhysicalHeightDpi();
     if (h > 0 && ph > 0) {
       return ((float) h) / ((float) ph);
     }
     else {
       return -1.0f;
     }
   }
 
   /**
    * If {@link #check()} was successful, returns the physical width of this
    * image in dpi (dots per inch) or -1 if no value could be found.
    * @return physical width (in dpi)
    * @see #getPhysicalHeightDpi()
    * @see #getPhysicalWidthInch()
    * @see #getPhysicalHeightInch()
    */
   public int getPhysicalWidthDpi() {
     return physicalWidthDpi;
   }
 
   /**
    * Returns the physical width of an image in inches, or <code>-1.0f</code> if
    * width information is not available. Assumes that {@link #check} has been
    * called successfully.
    * @return physical width in inches or <code>-1.0f</code> on failure
    * @see #getPhysicalWidthDpi
    * @see #getPhysicalHeightInch
    */
   public float getPhysicalWidthInch() {
     int w = getWidth();
     int pw = getPhysicalWidthDpi();
     if (w > 0 && pw > 0) {
       return ((float) w) / ((float) pw);
     }
     else {
       return -1.0f;
     }
   }
 
   private static int getShortBigEndian(byte[] a, int offs) {
     return (a[offs] & 0xff) << 8 | (a[offs + 1] & 0xff);
   }
 
   private static int getShortLittleEndian(byte[] a, int offs) {
     return (a[offs] & 0xff) | (a[offs + 1] & 0xff) << 8;
   }
 
   /**
    * If {@link #check()} was successful, returns one the image's horizontal
    * resolution in pixels.
    * @return image width in pixels
    */
   public int getWidth() {
     return width;
   }
 
   /**
    * Returns whether the image is stored in a progressive (also called:
    * interlaced) way.
    * @return true for progressive/interlaced, false otherwise
    */
   public boolean isProgressive() {
     return progressive;
   }
 
   /**
    * To use this class as a command line application, give it either some file
    * names as parameters (information on them will be printed to standard
    * output, one line per file) or call it with no parameters. It will then
    * check data given to it via standard input.
    * @param args the program arguments which must be file names
    */
   public static void main(String[] args) {
     ImageInfo imageInfo = new ImageInfo();
     imageInfo.setDetermineImageNumber(true);
     boolean verbose = determineVerbosity(args);
     if (args.length == 0) {
       run(null, System.in, imageInfo, verbose);
     }
     else {
       int index = 0;
       while (index < args.length) {
         InputStream in = null;
         try {
           String name = args[index++];
           // System.out.print(name + ";");
           if (name.startsWith("http://")) {
             in = new URL(name).openConnection().getInputStream();
           }
           else {
             in = new FileInputStream(name);
           }
           run(name, in, imageInfo, verbose);
           in.close();
         } catch (IOException e) {
           // System.out.println(e);
           try {
             in.close();
           } catch (IOException ee) {
           }
         }
       }
     }
   }
 
   private static void print(String sourceName, ImageInfo ii, boolean verbose) {
     if (verbose) {
       printVerbose(sourceName, ii);
     }
     else {
       printCompact(sourceName, ii);
     }
   }
 
   private static void printCompact(String sourceName, ImageInfo imageInfo) {
     final String SEP = "\t";
     /*
      * System.out.println( sourceName + SEP + imageInfo.getFormatName() + SEP +
      * imageInfo.getMimeType() + SEP + imageInfo.getWidth() + SEP +
      * imageInfo.getHeight() + SEP + imageInfo.getBitsPerPixel() + SEP +
      * imageInfo.getNumberOfImages() + SEP + imageInfo.getPhysicalWidthDpi() +
      * SEP + imageInfo.getPhysicalHeightDpi() + SEP +
      * imageInfo.getPhysicalWidthInch() + SEP +
      * imageInfo.getPhysicalHeightInch() + SEP + imageInfo.isProgressive() );
      */
   }
 
   private static void printLine(int indentLevels, String text, float value, float minValidValue) {
     if (value < minValidValue) {
       return;
     }
     printLine(indentLevels, text, Float.toString(value));
   }
 
   private static void printLine(int indentLevels, String text, int value, int minValidValue) {
     if (value >= minValidValue) {
       printLine(indentLevels, text, Integer.toString(value));
     }
   }
 
   private static void printLine(int indentLevels, String text, String value) {
     if (value == null || value.length() == 0) {
       return;
     }
     while (indentLevels-- > 0) {
       // System.out.print("\t");
     }
     if (text != null && text.length() > 0) {
       // System.out.print(text);
       // System.out.print(" ");
     }
     // System.out.println(value);
   }
 
   private static void printVerbose(String sourceName, ImageInfo ii) {
     printLine(0, null, sourceName);
     printLine(1, "File format: ", ii.getFormatName());
     printLine(1, "MIME type: ", ii.getMimeType());
     printLine(1, "Width (pixels): ", ii.getWidth(), 1);
     printLine(1, "Height (pixels): ", ii.getHeight(), 1);
     printLine(1, "Bits per pixel: ", ii.getBitsPerPixel(), 1);
     printLine(1, "Progressive: ", ii.isProgressive() ? "yes" : "no");
     printLine(1, "Number of images: ", ii.getNumberOfImages(), 1);
     printLine(1, "Physical width (dpi): ", ii.getPhysicalWidthDpi(), 1);
     printLine(1, "Physical height (dpi): ", ii.getPhysicalHeightDpi(), 1);
     printLine(1, "Physical width (inches): ", ii.getPhysicalWidthInch(), 1.0f);
     printLine(1, "Physical height (inches): ", ii.getPhysicalHeightInch(), 1.0f);
     int numComments = ii.getNumberOfComments();
     printLine(1, "Number of textual comments: ", numComments, 1);
     if (numComments > 0) {
       for (int i = 0; i < numComments; i++) {
         printLine(2, null, ii.getComment(i));
       }
     }
   }
 
   private int read() throws IOException {
     if (in != null) {
       return in.read();
     }
     else {
       return din.readByte();
     }
   }
 
   private int read(byte[] a) throws IOException {
     if (in != null) {
       return in.read(a);
     }
     else {
       din.readFully(a);
       return a.length;
     }
   }
 
   private int read(byte[] a, int offset, int num) throws IOException {
     if (in != null) {
       return in.read(a, offset, num);
     }
     else {
       din.readFully(a, offset, num);
       return num;
     }
   }
 
   private String readLine() throws IOException {
     return readLine(new StringBuffer());
   }
 
   private String readLine(StringBuffer sb) throws IOException {
     boolean finished;
     do {
       int value = read();
       finished = (value == -1 || value == 10);
       if (!finished) {
         sb.append((char) value);
       }
     } while (!finished);
     return sb.toString();
   }
 
   private long readUBits(int numBits) throws IOException {
     if (numBits == 0) {
       return 0;
     }
     int bitsLeft = numBits;
     long result = 0;
     if (bitPos == 0) { // no value in the buffer - read a byte
       if (in != null) {
         bitBuf = in.read();
       }
       else {
         bitBuf = din.readByte();
       }
       bitPos = 8;
     }
 
     while (true) {
       int shift = bitsLeft - bitPos;
       if (shift > 0) {
         // Consume the entire buffer
         result |= bitBuf << shift;
         bitsLeft -= bitPos;
 
         // Get the next byte from the input stream
         if (in != null) {
           bitBuf = in.read();
         }
         else {
           bitBuf = din.readByte();
         }
         bitPos = 8;
       }
       else {
         // Consume a portion of the buffer
         result |= bitBuf >> -shift;
         bitPos -= bitsLeft;
         bitBuf &= 0xff >> (8 - bitPos); // mask off the consumed bits
 
         return result;
       }
     }
   }
 
   /**
    * Read a signed integer value from input.
    * @param numBits number of bits to read
    */
   private int readSBits(int numBits) throws IOException {
     // Get the number as an unsigned value.
     long uBits = readUBits(numBits);
 
     // Is the number negative?
     if ((uBits & (1L << (numBits - 1))) != 0) {
       // Yes. Extend the sign.
       uBits |= -1L << numBits;
     }
 
     return (int) uBits;
   }
 
   /*
    * private void synchBits() { bitBuf = 0; bitPos = 0; }
    */
 
   /*
    * private String readLine(int firstChar) throws IOException { StringBuffer
    * result = new StringBuffer(); result.append((char)firstChar); return
    * readLine(result); }
    */
 
   private static void run(String sourceName, InputStream in, ImageInfo imageInfo, boolean verbose) {
     imageInfo.setInput(in);
     imageInfo.setDetermineImageNumber(true);
     imageInfo.setCollectComments(verbose);
     if (imageInfo.check()) {
       print(sourceName, imageInfo, verbose);
     }
   }
 
   /**
    * Specify whether textual comments are supposed to be extracted from input.
    * Default is <code>false</code>. If enabled, comments will be added to an
    * internal list.
    * @param newValue if <code>true</code>, this class will read comments
    * @see #getNumberOfComments
    * @see #getComment
    */
   public void setCollectComments(boolean newValue) {
     collectComments = newValue;
   }
 
   /**
    * Specify whether the number of images in a file is to be determined -
    * default is <code>false</code>. This is a special option because some file
    * formats require running over the entire file to find out the number of
    * images, a rather time-consuming task. Not all file formats support more
    * than one image. If this method is called with <code>true</code> as
    * argument, the actual number of images can be queried via
    * {@link #getNumberOfImages()} after a successful call to {@link #check()}.
    * @param newValue will the number of images be determined?
    * @see #getNumberOfImages
    */
   public void setDetermineImageNumber(boolean newValue) {
     determineNumberOfImages = newValue;
   }
 
   /**
    * Set the input stream to the argument stream (or file). Note that
    * {@link java.io.RandomAccessFile} implements {@link java.io.DataInput}.
    * @param dataInput the input stream to read from
    */
   public void setInput(DataInput dataInput) {
     din = dataInput;
     in = null;
   }
 
   /**
    * Set the input stream to the argument stream (or file).
    * @param inputStream the input stream to read from
    */
   public void setInput(InputStream inputStream) {
     in = inputStream;
     din = null;
   }
 
   private void setPhysicalHeightDpi(int newValue) {
     physicalWidthDpi = newValue;
   }
 
   private void setPhysicalWidthDpi(int newValue) {
     physicalHeightDpi = newValue;
   }
 
   private void skip(int num) throws IOException {
     while (num > 0) {
       long result;
       if (in != null) {
         result = in.skip(num);
       }
       else {
         result = din.skipBytes(num);
       }
       if (result > 0) {
         num -= result;
       }
     }
   }
 
   public void redimensionaImagem(int limite) {
 
     int larguraImagem;
     int alturaImagem;
     int diferenca1 = 0;
     int diferenca2 = 0;
     double proporcao = 0;
     double conversao = 0;
     int decimalPlace = 0;
 
     larguraImagem = this.getWidth();
     alturaImagem = this.getHeight();
 
     Integer largura = Integer.valueOf(larguraImagem);
     Integer altura = Integer.valueOf(alturaImagem);
     Integer limiteMaximo = Integer.valueOf(limite);
 
     if (larguraImagem > 0 && alturaImagem > 0) {
 
       if (larguraImagem < limite && alturaImagem > limite) {
 
         proporcao = altura.doubleValue() / limiteMaximo.doubleValue();
         conversao = largura.doubleValue() / proporcao;
 
         BigDecimal bd = new BigDecimal(conversao);
         bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
         conversao = bd.doubleValue();
 
         larguraImagem = (int) conversao;
         alturaImagem = limite;
 
       }
 
       if (larguraImagem > limite && alturaImagem < limite) {
 
         proporcao = largura.doubleValue() / limiteMaximo.doubleValue();
         conversao = altura.doubleValue() / proporcao;
 
         BigDecimal bd = new BigDecimal(conversao);
         bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
         conversao = bd.doubleValue();
 
         alturaImagem = (int) conversao;
         larguraImagem = limite;
 
       }
 
       if (larguraImagem > limite && alturaImagem > limite) {
 
         diferenca1 = larguraImagem - limite;
 
         diferenca2 = alturaImagem - limite;
 
         if (diferenca1 > diferenca2) {
 
           proporcao = largura.doubleValue() / limiteMaximo.doubleValue();
           conversao = altura.doubleValue() / proporcao;
 
           BigDecimal bd = new BigDecimal(conversao);
           bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
           conversao = bd.doubleValue();
 
           alturaImagem = (int) conversao;
           larguraImagem = limite;
 
         }
 
         if (diferenca1 < diferenca2) {
 
           proporcao = altura.doubleValue() / limiteMaximo.doubleValue();
           conversao = largura.doubleValue() / proporcao;
 
           BigDecimal bd = new BigDecimal(conversao);
           bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
           conversao = bd.doubleValue();
 
           larguraImagem = (int) conversao;
           alturaImagem = limite;
 
         }
 
         if (diferenca1 == diferenca2) {
 
           alturaImagem = limite;
           larguraImagem = limite;
         }
       }
     }
 
     this.width = larguraImagem;
     this.height = alturaImagem;
 
   }
 
   public void zoomImagem(String zoom) {
 
     int larguraImagem;
     int alturaImagem;
     double zoomAltura = 0;
     double zoomLargura = 0;
     int decimalPlace = 0;
 
     larguraImagem = this.getWidth();
     alturaImagem = this.getHeight();
 
     Integer largura = Integer.valueOf(larguraImagem);
     Integer altura = Integer.valueOf(alturaImagem);
 
     if ("50%".equals(zoom)) {
       zoomAltura = altura.doubleValue() * 0.5;
       zoomLargura = largura.doubleValue() * 0.5;
     }
 
     if ("75%".equals(zoom)) {
       zoomAltura = altura.doubleValue() * 0.75;
       zoomLargura = largura.doubleValue() * 0.75;
     }
 
     if ("150%".equals(zoom)) {
       zoomAltura = altura.doubleValue() * 1.5;
       zoomLargura = largura.doubleValue() * 1.5;
     }
 
     if ("200%".equals(zoom)) {
       zoomAltura = altura.doubleValue() * 2;
       zoomLargura = largura.doubleValue() * 2;
     }
 
     if ("300%".equals(zoom)) {
       zoomAltura = altura.doubleValue() * 3;
       zoomLargura = largura.doubleValue() * 3;
     }
 
     BigDecimal bdAltura = new BigDecimal(zoomAltura);
     bdAltura = bdAltura.setScale(decimalPlace, BigDecimal.ROUND_UP);
     zoomAltura = bdAltura.doubleValue();
 
     BigDecimal bdLargura = new BigDecimal(zoomLargura);
     bdLargura = bdLargura.setScale(decimalPlace, BigDecimal.ROUND_UP);
     zoomLargura = bdLargura.doubleValue();
 
     alturaImagem = (int) zoomAltura;
     larguraImagem = (int) zoomLargura;
 
     this.width = larguraImagem;
     this.height = alturaImagem;
 
   }
 
 }